Method for the manufacture of high-speed circular friction-saws.



I c. F. ROBINSON.

METHOD FOR THE MANUFACTURE OF'HIGH SPEED CIRCULAR FRICTION SAWS.

APPLICATION FILED DEC. 3. I9I4.

EI-noentoz 6 11 9 I n 8 \II, 2% \\I I an. Mn o d m: I o m a P W a o v. I m II R L I t R mw QN 7 5 9 H 7 1L 1 c. F. ROBINSON. METHQD FOR THE MANUFACTURE OF HIGH SPEED CIRCULAR FRICTION SAWS.

APPLICATION F|LE D DEC. 3. i914.

Patenfd Mar. 28, 191

2 SIHEETS SI'HEET 2.

auumko'c C- Wa /29077 witness Quorum arnn'r ornron. I CHARLES E. ROBINSQN, OF SAN FRAIhTdISCO, CALIFORNIA,

METHOD FOR THE MANUFACTURE OF HIGH-SPEED CIRCULAR FRICTION-SAWS. v

15 77357. Specification of LettersI atent. Pgtmited Emma .28 1916.

Application filed December3, 1914. Serial No. 876,324.

I To all whom it may concern Be it known that 1, CHARLES F. ROBINSON, a citizen of the United States, residingat San Francisco, inthe county of SanFrancisco. and State of California, have invented certain new and useful Improvements in Methods for the Manufacture of High Speed Circular Friction-Saws, of which the following is a specification.

This invention aims to disclose a novel method of manufacturing high speed friction circular saws, such as are employed in the cutting of metal, and also aims to pro vide a highly efficient machine for use in carryingout the method.

7 Originally the high speed friction c1rcular saws were toothless, dependence being placed entirely upon the capabilities .of their smooth peripheral surfaces wearing away. by'friction. any metal presentedto the saw. Such. a saw presented the disadvantage, However, that the metal could not be quicklycut thereby, and, furthermore, due to the abrading action of the work upon the saw, the life of the saw was comparatively short. Efiorts were made to overcome the disadvantages presented by a smooth edged-sawby cutting small notches or nicks 1n the peripheral surface of the saw, by thense of a chisel, this however did not give satisfactory results for the notches were of unequal depth and frequently the chisel would produce a small fracture in the saw, which would of course in time result in the burst- 35 ing of the saw.

The present invention therefore anns to provide for the formation of teeth in the peripheral surface of the saw disk of uniform size and shape and without likelihood of fracturing the saw.

In the accompanyingdrawings: Figure l 3 is a side elejtation of the machine employed in carrying out the present invention. 2 is a top plan view thereof Fig. 3 1's a top plan view, illustrating a slight n1od1iication of the invention. Fig. 4: 1s a view similar to Fig. 3, illustrating another mod1fication. Fig. 5 is a detail'fragmcntary srde elevation of a portion "of the'saw disk. Fig. 6 is a transverse sectional view through aportion of the saw disk.

Corresponding and like parts are referred to in the following description and 1nd1- cated in all the views of the accompanying 55 drawings by the same reference characters. In carrying out the method of the present inyention, a saw disk blank is rotated by any sultable means, and during its rotative movement a toothed roller is held under a high degree of pressure against the peripheral surface of the saw disk blank, the roller being rotated by the said disk. During this operation the saw disk blank is not subjected suitable means kept at a low degree of term perature. As a consequence, the'teeth are formed by the pressing of. the teeth upon the roller into the peripheral surface'of the saw disk blank, the metal of the disk being pressed laterally as well as inwardly, so that in' the finished article, the teeth will be of a width greaterthan the thickness of the body portion of the disk;

. In the drawings, the in general by the numeral land isteniporarily fixed upon a shaft or spindle 2, mounted in suitable bearings 3, upon a frame-4. Any suitable means, as for-example, a belt and pulley 5 maybe provided for imparting rotary movement to the spindle 2, and in order to guard against accidents a suitable shield or guard 6 is preferably mounted upon the frame 4 and extends over or covers nearly the entire upper portion of the saw disk. As before stated, the teeth are cut in the periphery of the saw disk by means of a toothed roller, and in the drawings, this roller is indicated by the numeral 7 and its teeth by the numeral 8. It will be observed that the roller is of a diameter considerably less than that of the saw disk in the periph-' the said roller is of a length considerably greater than the thickness of the 'saw disk, so that when one portion of the roller becomes worn or its effectiveness is otherwise impaired, a new portion of the surfaceof the roller may be brought into cooperative relation to the saw disk, This roller 7 is mounted upon a suitable spindle 9 or it may be provided with trunnions at its ends, and this spindle or trunnions, as the case may be, is rotatably mounted in suitable bearings 10 upon a head 11. I

The numeral 12 indicates a bed upon which the head 11 is adjustably mounted,

boss 13 and the head being formed with a transverse dove-tailed groove 14, the walls of which fit the boss. It will be apparent that the head is-im this mannerfirmly, sup

to heat, but, on the other hand, is by. any

saw. disk is indicated cry of which the teeth are to be cut, and that the bed being provided with a dove-tailed In ore er that the roller 7, which is mounted poif'ted and thati't may he adjusted transedupon a suitable frame 15 provided with an; abutment 1G and with a guide 17 which extends longitudinally of the top of the frame and forwardly from the abutment.

The bed 12 isprovided in its under side with a groovefittmgthe said guide 17 and by reason of this construction, the bed 12 is held against lateral displacement but is mounted for novelnent toward and from the saw disk-1.. It will now be apparent.

that the head 11 is supported for adjustment in the direction ofthe saw disk 1 and transversel of. the peripheral surface thereof.

upon the head 11, may be caused to bear firml against the peripheral surface of the saW-.. isk, ac dinder 18 is mountedv upon the rear end of the hand 11 and a piston 19 1s mounted to Work within the'said cylinder. The stem of the piston 191s provided w th I a spherical headC Qwhich bears against the forward face of theiabutment 16, andth'e 5 sure andthis pipe'is connected in any suitpurpese of-this construction will-be pres ently explained. v

The numeral 21 indicates a pipe leading from any sultable source of fluid under presable manner with an inlet pipe 22' for the forward end of the cylinder 18. A cut-ofl VfllVQQ'wl: is interposed in the supply pipe as also a throttle valve 23. As before stated,

the disk 7 isprovided with teeth upon its circumferential surface and these teeth extend. longitudinally ofthe said surface and. parallel to the axis ofthe roller.

' head -11 having been adjusted to bring an effective portion of the toothed portion of the roller 7 opposite the periphery of the saw disk blank, the throttle valve 23 is opened. The fluid under pressure from the f pipe 21 entering the forward end of the cylinder 18' and exertinga force agamst the head of the piston, which force is resisted by the thrust of the piston rod against the abutment 16, the said cylinder and the. head 11 connectedtherewith will be moved in the directiqn of the saw disk blank. The saw disk motion to the toothed roller 7 and, as the periphery of the said disk blank travels against the toothed periphery of the saidroller 7, the teeth upon the roller will be forced into the material of the blank, crowding the material inwardly and laterally.

Inasmuch as no means isprovided for preventing lateral crowding of the material of .the saw disk blank, the teeth formed on the 1 I periphery 'of the blank will be of n Width greater than the thickness of the body p013 the saw.

blank will of courseimpart rotary.

' tion of the disk, so that when the saw is put versely of the bed-12. The bed 12 is mountinto use, the peculiar formation of its toothed periphery will afford-clearance for that" portion of the saw inwardly of the teeth, and the cutting operation may be as complished rapidly and effectually and with- I out danger of the saw becoming highly heated. The character of the teeth formed clearly in Figsu5 and 60f the-drawings, in

in the periphery of the. saw disk is shownwhich figures, the teeth are indicated-by the numeral 25 and their projecting or laterally extending sides are indicated by the numetal-'26. I

While ,I' prefer to. use fluid under pressure for the purpose of holding the toothed roller firmly against the periphery of'the saw disk blank, I may make use of the structure,

shown in Figs. 3 and 4 ofthe drawings, or, in fact, of any other suitable means for. a'c- A roller may be;brought into position opposite In L the periphery of the said disk. blank. the structureshown in FigJl, a lever 29 is mounted upon the bed 12 and connected by lever 31 is also mounted upon the bed and connectedby means'of links 32 withthe said head 11. By manipulating the lever 29, the

head 11 may be adjusted transversely of the bed 12 and by manipulating the .lever'3l the head 11 may be forced in the direction of the saw disk blank so asvto cause the toothed roller to bear-firmly against the periphery thereof.

It will of course be understood that the machine embodying. the present invention 'may be used for resetting and resharpening' the teeth of high speed friction saws equally as well as it-may ,be employed for the initial cutting "or formation of the said teeth;

Having thus described the what is claimed as new is 1. That method of producing high v invention,

speed friction circular saws which includes the step of rotating a saw diskblank in peripheral' contact with a toothed roller, in the absenceof heat and under pressure.

2. That method of producing high speed friction circular .saws which includes the step of rotating a saw disk blank in periph- "eral contact with a toothed roller-without the employment of any means for laterally compressing the peripheral portion of the blank, whereby the material of the blank willbe crowded inwardly and laterally to form teeth of a width greaterthan the thickness of the blank.

means ofa link 30 to the head 11,- and a 3. That method of producing high speed blank at the periphery thereof when acted 10 friction circular" saws which includes the upon by the said toothed roller. step of rotating a disk'blank in peripheral In testimony whereof I aifix my signature cfintzgit yiith a toiothgd rol1er,hthe side}? of in presence of two witnesses. 5te an at an ajacentteperip er thereof being free from. lateral obstructioii CHARJES ROBINSON throughout the entire circumference of the Witnesses:

blank whereby to permit of lateral as well as MARY F. HUEY, inward crowding of the material of the H. J. LINN. 

